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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.4 * All Rights Reserved.5 */6#include "xfs.h"7#include "xfs_fs.h"8#include "xfs_shared.h"9#include "xfs_format.h"10#include "xfs_log_format.h"11#include "xfs_trans_resv.h"12#include "xfs_mount.h"13#include "xfs_inode.h"14#include "xfs_trans.h"15#include "xfs_dir2.h"16#include "xfs_dir2_priv.h"17#include "xfs_trace.h"18 19/*20 * Prototypes for internal functions.21 */22static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,23 xfs_dir2_sf_entry_t *sfep,24 xfs_dir2_data_aoff_t offset,25 int new_isize);26static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,27 int new_isize);28static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,29 xfs_dir2_sf_entry_t **sfepp,30 xfs_dir2_data_aoff_t *offsetp);31#ifdef DEBUG32static void xfs_dir2_sf_check(xfs_da_args_t *args);33#else34#define xfs_dir2_sf_check(args)35#endif /* DEBUG */36 37static void xfs_dir2_sf_toino4(xfs_da_args_t *args);38static void xfs_dir2_sf_toino8(xfs_da_args_t *args);39 40int41xfs_dir2_sf_entsize(42 struct xfs_mount *mp,43 struct xfs_dir2_sf_hdr *hdr,44 int len)45{46 int count = len;47 48 count += sizeof(struct xfs_dir2_sf_entry); /* namelen + offset */49 count += hdr->i8count ? XFS_INO64_SIZE : XFS_INO32_SIZE; /* ino # */50 51 if (xfs_has_ftype(mp))52 count += sizeof(uint8_t);53 return count;54}55 56struct xfs_dir2_sf_entry *57xfs_dir2_sf_nextentry(58 struct xfs_mount *mp,59 struct xfs_dir2_sf_hdr *hdr,60 struct xfs_dir2_sf_entry *sfep)61{62 return (void *)sfep + xfs_dir2_sf_entsize(mp, hdr, sfep->namelen);63}64 65/*66 * In short-form directory entries the inode numbers are stored at variable67 * offset behind the entry name. If the entry stores a filetype value, then it68 * sits between the name and the inode number. The actual inode numbers can69 * come in two formats as well, either 4 bytes or 8 bytes wide.70 */71xfs_ino_t72xfs_dir2_sf_get_ino(73 struct xfs_mount *mp,74 struct xfs_dir2_sf_hdr *hdr,75 struct xfs_dir2_sf_entry *sfep)76{77 uint8_t *from = sfep->name + sfep->namelen;78 79 if (xfs_has_ftype(mp))80 from++;81 82 if (!hdr->i8count)83 return get_unaligned_be32(from);84 return get_unaligned_be64(from) & XFS_MAXINUMBER;85}86 87void88xfs_dir2_sf_put_ino(89 struct xfs_mount *mp,90 struct xfs_dir2_sf_hdr *hdr,91 struct xfs_dir2_sf_entry *sfep,92 xfs_ino_t ino)93{94 uint8_t *to = sfep->name + sfep->namelen;95 96 ASSERT(ino <= XFS_MAXINUMBER);97 98 if (xfs_has_ftype(mp))99 to++;100 101 if (hdr->i8count)102 put_unaligned_be64(ino, to);103 else104 put_unaligned_be32(ino, to);105}106 107xfs_ino_t108xfs_dir2_sf_get_parent_ino(109 struct xfs_dir2_sf_hdr *hdr)110{111 if (!hdr->i8count)112 return get_unaligned_be32(hdr->parent);113 return get_unaligned_be64(hdr->parent) & XFS_MAXINUMBER;114}115 116void117xfs_dir2_sf_put_parent_ino(118 struct xfs_dir2_sf_hdr *hdr,119 xfs_ino_t ino)120{121 ASSERT(ino <= XFS_MAXINUMBER);122 123 if (hdr->i8count)124 put_unaligned_be64(ino, hdr->parent);125 else126 put_unaligned_be32(ino, hdr->parent);127}128 129/*130 * The file type field is stored at the end of the name for filetype enabled131 * shortform directories, or not at all otherwise.132 */133uint8_t134xfs_dir2_sf_get_ftype(135 struct xfs_mount *mp,136 struct xfs_dir2_sf_entry *sfep)137{138 if (xfs_has_ftype(mp)) {139 uint8_t ftype = sfep->name[sfep->namelen];140 141 if (ftype < XFS_DIR3_FT_MAX)142 return ftype;143 }144 145 return XFS_DIR3_FT_UNKNOWN;146}147 148void149xfs_dir2_sf_put_ftype(150 struct xfs_mount *mp,151 struct xfs_dir2_sf_entry *sfep,152 uint8_t ftype)153{154 ASSERT(ftype < XFS_DIR3_FT_MAX);155 156 if (xfs_has_ftype(mp))157 sfep->name[sfep->namelen] = ftype;158}159 160/*161 * Given a block directory (dp/block), calculate its size as a shortform (sf)162 * directory and a header for the sf directory, if it will fit it the163 * space currently present in the inode. If it won't fit, the output164 * size is too big (but not accurate).165 */166int /* size for sf form */167xfs_dir2_block_sfsize(168 xfs_inode_t *dp, /* incore inode pointer */169 xfs_dir2_data_hdr_t *hdr, /* block directory data */170 xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */171{172 xfs_dir2_dataptr_t addr; /* data entry address */173 xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */174 xfs_dir2_block_tail_t *btp; /* tail area of the block */175 int count; /* shortform entry count */176 xfs_dir2_data_entry_t *dep; /* data entry in the block */177 int i; /* block entry index */178 int i8count; /* count of big-inode entries */179 int isdot; /* entry is "." */180 int isdotdot; /* entry is ".." */181 xfs_mount_t *mp; /* mount structure pointer */182 int namelen; /* total name bytes */183 xfs_ino_t parent = 0; /* parent inode number */184 int size=0; /* total computed size */185 int has_ftype;186 struct xfs_da_geometry *geo;187 188 mp = dp->i_mount;189 geo = mp->m_dir_geo;190 191 /*192 * if there is a filetype field, add the extra byte to the namelen193 * for each entry that we see.194 */195 has_ftype = xfs_has_ftype(mp) ? 1 : 0;196 197 count = i8count = namelen = 0;198 btp = xfs_dir2_block_tail_p(geo, hdr);199 blp = xfs_dir2_block_leaf_p(btp);200 201 /*202 * Iterate over the block's data entries by using the leaf pointers.203 */204 for (i = 0; i < be32_to_cpu(btp->count); i++) {205 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)206 continue;207 /*208 * Calculate the pointer to the entry at hand.209 */210 dep = (xfs_dir2_data_entry_t *)((char *)hdr +211 xfs_dir2_dataptr_to_off(geo, addr));212 /*213 * Detect . and .., so we can special-case them.214 * . is not included in sf directories.215 * .. is included by just the parent inode number.216 */217 isdot = dep->namelen == 1 && dep->name[0] == '.';218 isdotdot =219 dep->namelen == 2 &&220 dep->name[0] == '.' && dep->name[1] == '.';221 222 if (!isdot)223 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;224 225 /* take into account the file type field */226 if (!isdot && !isdotdot) {227 count++;228 namelen += dep->namelen + has_ftype;229 } else if (isdotdot)230 parent = be64_to_cpu(dep->inumber);231 /*232 * Calculate the new size, see if we should give up yet.233 */234 size = xfs_dir2_sf_hdr_size(i8count) + /* header */235 count * 3 * sizeof(u8) + /* namelen + offset */236 namelen + /* name */237 (i8count ? /* inumber */238 count * XFS_INO64_SIZE :239 count * XFS_INO32_SIZE);240 if (size > xfs_inode_data_fork_size(dp))241 return size; /* size value is a failure */242 }243 /*244 * Create the output header, if it worked.245 */246 sfhp->count = count;247 sfhp->i8count = i8count;248 xfs_dir2_sf_put_parent_ino(sfhp, parent);249 return size;250}251 252/*253 * Convert a block format directory to shortform.254 * Caller has already checked that it will fit, and built us a header.255 */256int /* error */257xfs_dir2_block_to_sf(258 struct xfs_da_args *args, /* operation arguments */259 struct xfs_buf *bp,260 int size, /* shortform directory size */261 struct xfs_dir2_sf_hdr *sfhp) /* shortform directory hdr */262{263 struct xfs_inode *dp = args->dp;264 struct xfs_mount *mp = dp->i_mount;265 int error; /* error return value */266 int logflags; /* inode logging flags */267 struct xfs_dir2_sf_entry *sfep; /* shortform entry */268 struct xfs_dir2_sf_hdr *sfp; /* shortform directory header */269 unsigned int offset = args->geo->data_entry_offset;270 unsigned int end;271 272 trace_xfs_dir2_block_to_sf(args);273 274 /*275 * Allocate a temporary destination buffer the size of the inode to276 * format the data into. Once we have formatted the data, we can free277 * the block and copy the formatted data into the inode literal area.278 */279 sfp = kmalloc(mp->m_sb.sb_inodesize, GFP_KERNEL | __GFP_NOFAIL);280 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));281 282 /*283 * Loop over the active and unused entries. Stop when we reach the284 * leaf/tail portion of the block.285 */286 end = xfs_dir3_data_end_offset(args->geo, bp->b_addr);287 sfep = xfs_dir2_sf_firstentry(sfp);288 while (offset < end) {289 struct xfs_dir2_data_unused *dup = bp->b_addr + offset;290 struct xfs_dir2_data_entry *dep = bp->b_addr + offset;291 292 /*293 * If it's unused, just skip over it.294 */295 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {296 offset += be16_to_cpu(dup->length);297 continue;298 }299 300 /*301 * Skip .302 */303 if (dep->namelen == 1 && dep->name[0] == '.')304 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);305 /*306 * Skip .., but make sure the inode number is right.307 */308 else if (dep->namelen == 2 &&309 dep->name[0] == '.' && dep->name[1] == '.')310 ASSERT(be64_to_cpu(dep->inumber) ==311 xfs_dir2_sf_get_parent_ino(sfp));312 /*313 * Normal entry, copy it into shortform.314 */315 else {316 sfep->namelen = dep->namelen;317 xfs_dir2_sf_put_offset(sfep, offset);318 memcpy(sfep->name, dep->name, dep->namelen);319 xfs_dir2_sf_put_ino(mp, sfp, sfep,320 be64_to_cpu(dep->inumber));321 xfs_dir2_sf_put_ftype(mp, sfep,322 xfs_dir2_data_get_ftype(mp, dep));323 324 sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);325 }326 offset += xfs_dir2_data_entsize(mp, dep->namelen);327 }328 ASSERT((char *)sfep - (char *)sfp == size);329 330 /* now we are done with the block, we can shrink the inode */331 logflags = XFS_ILOG_CORE;332 error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);333 if (error) {334 ASSERT(error != -ENOSPC);335 goto out;336 }337 338 /*339 * The buffer is now unconditionally gone, whether340 * xfs_dir2_shrink_inode worked or not.341 *342 * Convert the inode to local format and copy the data in.343 */344 ASSERT(dp->i_df.if_bytes == 0);345 xfs_init_local_fork(dp, XFS_DATA_FORK, sfp, size);346 dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;347 dp->i_disk_size = size;348 349 logflags |= XFS_ILOG_DDATA;350 xfs_dir2_sf_check(args);351out:352 xfs_trans_log_inode(args->trans, dp, logflags);353 kfree(sfp);354 return error;355}356 357/*358 * Add a name to a shortform directory.359 * There are two algorithms, "easy" and "hard" which we decide on360 * before changing anything.361 * Convert to block form if necessary, if the new entry won't fit.362 */363int /* error */364xfs_dir2_sf_addname(365 xfs_da_args_t *args) /* operation arguments */366{367 struct xfs_inode *dp = args->dp;368 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;369 int error; /* error return value */370 int incr_isize; /* total change in size */371 int new_isize; /* size after adding name */372 int objchange; /* changing to 8-byte inodes */373 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */374 int pick; /* which algorithm to use */375 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */376 377 trace_xfs_dir2_sf_addname(args);378 379 ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);380 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);381 ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));382 ASSERT(dp->i_df.if_bytes == dp->i_disk_size);383 ASSERT(sfp != NULL);384 ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));385 /*386 * Compute entry (and change in) size.387 */388 incr_isize = xfs_dir2_sf_entsize(dp->i_mount, sfp, args->namelen);389 objchange = 0;390 391 /*392 * Do we have to change to 8 byte inodes?393 */394 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {395 /*396 * Yes, adjust the inode size. old count + (parent + new)397 */398 incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;399 objchange = 1;400 }401 402 new_isize = (int)dp->i_disk_size + incr_isize;403 /*404 * Won't fit as shortform any more (due to size),405 * or the pick routine says it won't (due to offset values).406 */407 if (new_isize > xfs_inode_data_fork_size(dp) ||408 (pick =409 xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {410 /*411 * Just checking or no space reservation, it doesn't fit.412 */413 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)414 return -ENOSPC;415 /*416 * Convert to block form then add the name.417 */418 error = xfs_dir2_sf_to_block(args);419 if (error)420 return error;421 return xfs_dir2_block_addname(args);422 }423 /*424 * Just checking, it fits.425 */426 if (args->op_flags & XFS_DA_OP_JUSTCHECK)427 return 0;428 /*429 * Do it the easy way - just add it at the end.430 */431 if (pick == 1)432 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);433 /*434 * Do it the hard way - look for a place to insert the new entry.435 * Convert to 8 byte inode numbers first if necessary.436 */437 else {438 ASSERT(pick == 2);439 if (objchange)440 xfs_dir2_sf_toino8(args);441 xfs_dir2_sf_addname_hard(args, objchange, new_isize);442 }443 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);444 return 0;445}446 447/*448 * Add the new entry the "easy" way.449 * This is copying the old directory and adding the new entry at the end.450 * Since it's sorted by "offset" we need room after the last offset451 * that's already there, and then room to convert to a block directory.452 * This is already checked by the pick routine.453 */454static void455xfs_dir2_sf_addname_easy(456 xfs_da_args_t *args, /* operation arguments */457 xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */458 xfs_dir2_data_aoff_t offset, /* offset to use for new ent */459 int new_isize) /* new directory size */460{461 struct xfs_inode *dp = args->dp;462 struct xfs_mount *mp = dp->i_mount;463 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;464 int byteoff = (int)((char *)sfep - (char *)sfp);465 466 /*467 * Grow the in-inode space.468 */469 sfp = xfs_idata_realloc(dp, xfs_dir2_sf_entsize(mp, sfp, args->namelen),470 XFS_DATA_FORK);471 /*472 * Need to set up again due to realloc of the inode data.473 */474 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);475 /*476 * Fill in the new entry.477 */478 sfep->namelen = args->namelen;479 xfs_dir2_sf_put_offset(sfep, offset);480 memcpy(sfep->name, args->name, sfep->namelen);481 xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);482 xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);483 484 /*485 * Update the header and inode.486 */487 sfp->count++;488 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)489 sfp->i8count++;490 dp->i_disk_size = new_isize;491 xfs_dir2_sf_check(args);492}493 494/*495 * Add the new entry the "hard" way.496 * The caller has already converted to 8 byte inode numbers if necessary,497 * in which case we need to leave the i8count at 1.498 * Find a hole that the new entry will fit into, and copy499 * the first part of the entries, the new entry, and the last part of500 * the entries.501 */502/* ARGSUSED */503static void504xfs_dir2_sf_addname_hard(505 xfs_da_args_t *args, /* operation arguments */506 int objchange, /* changing inode number size */507 int new_isize) /* new directory size */508{509 struct xfs_inode *dp = args->dp;510 struct xfs_mount *mp = dp->i_mount;511 int add_datasize; /* data size need for new ent */512 char *buf; /* buffer for old */513 int eof; /* reached end of old dir */514 int nbytes; /* temp for byte copies */515 xfs_dir2_data_aoff_t new_offset; /* next offset value */516 xfs_dir2_data_aoff_t offset; /* current offset value */517 int old_isize; /* previous size */518 xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */519 xfs_dir2_sf_hdr_t *oldsfp; /* original shortform dir */520 xfs_dir2_sf_entry_t *sfep; /* entry in new dir */521 xfs_dir2_sf_hdr_t *sfp; /* new shortform dir */522 523 /*524 * Copy the old directory to the stack buffer.525 */526 old_isize = (int)dp->i_disk_size;527 buf = kmalloc(old_isize, GFP_KERNEL | __GFP_NOFAIL);528 oldsfp = (xfs_dir2_sf_hdr_t *)buf;529 memcpy(oldsfp, dp->i_df.if_data, old_isize);530 /*531 * Loop over the old directory finding the place we're going532 * to insert the new entry.533 * If it's going to end up at the end then oldsfep will point there.534 */535 for (offset = args->geo->data_first_offset,536 oldsfep = xfs_dir2_sf_firstentry(oldsfp),537 add_datasize = xfs_dir2_data_entsize(mp, args->namelen),538 eof = (char *)oldsfep == &buf[old_isize];539 !eof;540 offset = new_offset + xfs_dir2_data_entsize(mp, oldsfep->namelen),541 oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep),542 eof = (char *)oldsfep == &buf[old_isize]) {543 new_offset = xfs_dir2_sf_get_offset(oldsfep);544 if (offset + add_datasize <= new_offset)545 break;546 }547 /*548 * Get rid of the old directory, then allocate space for549 * the new one. We do this so xfs_idata_realloc won't copy550 * the data.551 */552 xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);553 sfp = xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);554 555 /*556 * Copy the first part of the directory, including the header.557 */558 nbytes = (int)((char *)oldsfep - (char *)oldsfp);559 memcpy(sfp, oldsfp, nbytes);560 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);561 /*562 * Fill in the new entry, and update the header counts.563 */564 sfep->namelen = args->namelen;565 xfs_dir2_sf_put_offset(sfep, offset);566 memcpy(sfep->name, args->name, sfep->namelen);567 xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);568 xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);569 sfp->count++;570 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)571 sfp->i8count++;572 /*573 * If there's more left to copy, do that.574 */575 if (!eof) {576 sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);577 memcpy(sfep, oldsfep, old_isize - nbytes);578 }579 kfree(buf);580 dp->i_disk_size = new_isize;581 xfs_dir2_sf_check(args);582}583 584/*585 * Decide if the new entry will fit at all.586 * If it will fit, pick between adding the new entry to the end (easy)587 * or somewhere else (hard).588 * Return 0 (won't fit), 1 (easy), 2 (hard).589 */590/*ARGSUSED*/591static int /* pick result */592xfs_dir2_sf_addname_pick(593 xfs_da_args_t *args, /* operation arguments */594 int objchange, /* inode # size changes */595 xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */596 xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */597{598 struct xfs_inode *dp = args->dp;599 struct xfs_mount *mp = dp->i_mount;600 int holefit; /* found hole it will fit in */601 int i; /* entry number */602 xfs_dir2_data_aoff_t offset; /* data block offset */603 xfs_dir2_sf_entry_t *sfep; /* shortform entry */604 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;605 int size; /* entry's data size */606 int used; /* data bytes used */607 608 size = xfs_dir2_data_entsize(mp, args->namelen);609 offset = args->geo->data_first_offset;610 sfep = xfs_dir2_sf_firstentry(sfp);611 holefit = 0;612 /*613 * Loop over sf entries.614 * Keep track of data offset and whether we've seen a place615 * to insert the new entry.616 */617 for (i = 0; i < sfp->count; i++) {618 if (!holefit)619 holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);620 offset = xfs_dir2_sf_get_offset(sfep) +621 xfs_dir2_data_entsize(mp, sfep->namelen);622 sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);623 }624 /*625 * Calculate data bytes used excluding the new entry, if this626 * was a data block (block form directory).627 */628 used = offset +629 (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +630 (uint)sizeof(xfs_dir2_block_tail_t);631 /*632 * If it won't fit in a block form then we can't insert it,633 * we'll go back, convert to block, then try the insert and convert634 * to leaf.635 */636 if (used + (holefit ? 0 : size) > args->geo->blksize)637 return 0;638 /*639 * If changing the inode number size, do it the hard way.640 */641 if (objchange)642 return 2;643 /*644 * If it won't fit at the end then do it the hard way (use the hole).645 */646 if (used + size > args->geo->blksize)647 return 2;648 /*649 * Do it the easy way.650 */651 *sfepp = sfep;652 *offsetp = offset;653 return 1;654}655 656#ifdef DEBUG657/*658 * Check consistency of shortform directory, assert if bad.659 */660static void661xfs_dir2_sf_check(662 xfs_da_args_t *args) /* operation arguments */663{664 struct xfs_inode *dp = args->dp;665 struct xfs_mount *mp = dp->i_mount;666 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;667 int i; /* entry number */668 int i8count; /* number of big inode#s */669 xfs_ino_t ino; /* entry inode number */670 int offset; /* data offset */671 xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */672 673 offset = args->geo->data_first_offset;674 ino = xfs_dir2_sf_get_parent_ino(sfp);675 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;676 677 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);678 i < sfp->count;679 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {680 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);681 ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);682 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;683 offset =684 xfs_dir2_sf_get_offset(sfep) +685 xfs_dir2_data_entsize(mp, sfep->namelen);686 ASSERT(xfs_dir2_sf_get_ftype(mp, sfep) < XFS_DIR3_FT_MAX);687 }688 ASSERT(i8count == sfp->i8count);689 ASSERT((char *)sfep - (char *)sfp == dp->i_disk_size);690 ASSERT(offset +691 (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +692 (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);693}694#endif /* DEBUG */695 696/* Verify the consistency of an inline directory. */697xfs_failaddr_t698xfs_dir2_sf_verify(699 struct xfs_mount *mp,700 struct xfs_dir2_sf_hdr *sfp,701 int64_t size)702{703 struct xfs_dir2_sf_entry *sfep;704 struct xfs_dir2_sf_entry *next_sfep;705 char *endp;706 xfs_ino_t ino;707 int i;708 int i8count;709 int offset;710 int error;711 uint8_t filetype;712 713 /*714 * Give up if the directory is way too short.715 */716 if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||717 size < xfs_dir2_sf_hdr_size(sfp->i8count))718 return __this_address;719 720 endp = (char *)sfp + size;721 722 /* Check .. entry */723 ino = xfs_dir2_sf_get_parent_ino(sfp);724 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;725 error = xfs_dir_ino_validate(mp, ino);726 if (error)727 return __this_address;728 offset = mp->m_dir_geo->data_first_offset;729 730 /* Check all reported entries */731 sfep = xfs_dir2_sf_firstentry(sfp);732 for (i = 0; i < sfp->count; i++) {733 /*734 * struct xfs_dir2_sf_entry has a variable length.735 * Check the fixed-offset parts of the structure are736 * within the data buffer.737 */738 if (((char *)sfep + sizeof(*sfep)) >= endp)739 return __this_address;740 741 /* Don't allow names with known bad length. */742 if (sfep->namelen == 0)743 return __this_address;744 745 /*746 * Check that the variable-length part of the structure is747 * within the data buffer. The next entry starts after the748 * name component, so nextentry is an acceptable test.749 */750 next_sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);751 if (endp < (char *)next_sfep)752 return __this_address;753 754 /* Check that the offsets always increase. */755 if (xfs_dir2_sf_get_offset(sfep) < offset)756 return __this_address;757 758 /* Check the inode number. */759 ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);760 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;761 error = xfs_dir_ino_validate(mp, ino);762 if (error)763 return __this_address;764 765 /* Check the file type. */766 filetype = xfs_dir2_sf_get_ftype(mp, sfep);767 if (filetype >= XFS_DIR3_FT_MAX)768 return __this_address;769 770 offset = xfs_dir2_sf_get_offset(sfep) +771 xfs_dir2_data_entsize(mp, sfep->namelen);772 773 sfep = next_sfep;774 }775 if (i8count != sfp->i8count)776 return __this_address;777 if ((void *)sfep != (void *)endp)778 return __this_address;779 780 /* Make sure this whole thing ought to be in local format. */781 if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +782 (uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize)783 return __this_address;784 785 return NULL;786}787 788/*789 * Create a new (shortform) directory.790 */791int /* error, always 0 */792xfs_dir2_sf_create(793 xfs_da_args_t *args, /* operation arguments */794 xfs_ino_t pino) /* parent inode number */795{796 xfs_inode_t *dp; /* incore directory inode */797 int i8count; /* parent inode is an 8-byte number */798 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */799 int size; /* directory size */800 801 trace_xfs_dir2_sf_create(args);802 803 dp = args->dp;804 805 ASSERT(dp != NULL);806 ASSERT(dp->i_disk_size == 0);807 /*808 * If it's currently a zero-length extent file,809 * convert it to local format.810 */811 if (dp->i_df.if_format == XFS_DINODE_FMT_EXTENTS) {812 dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;813 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);814 }815 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);816 ASSERT(dp->i_df.if_bytes == 0);817 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;818 size = xfs_dir2_sf_hdr_size(i8count);819 820 /*821 * Make a buffer for the data and fill in the header.822 */823 sfp = xfs_idata_realloc(dp, size, XFS_DATA_FORK);824 sfp->i8count = i8count;825 826 /*827 * Now can put in the inode number, since i8count is set.828 */829 xfs_dir2_sf_put_parent_ino(sfp, pino);830 sfp->count = 0;831 dp->i_disk_size = size;832 xfs_dir2_sf_check(args);833 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);834 return 0;835}836 837/*838 * Lookup an entry in a shortform directory.839 * Returns EEXIST if found, ENOENT if not found.840 */841int /* error */842xfs_dir2_sf_lookup(843 xfs_da_args_t *args) /* operation arguments */844{845 struct xfs_inode *dp = args->dp;846 struct xfs_mount *mp = dp->i_mount;847 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;848 int i; /* entry index */849 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */850 enum xfs_dacmp cmp; /* comparison result */851 xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */852 853 trace_xfs_dir2_sf_lookup(args);854 855 xfs_dir2_sf_check(args);856 857 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);858 ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));859 ASSERT(dp->i_df.if_bytes == dp->i_disk_size);860 ASSERT(sfp != NULL);861 ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));862 /*863 * Special case for .864 */865 if (args->namelen == 1 && args->name[0] == '.') {866 args->inumber = dp->i_ino;867 args->cmpresult = XFS_CMP_EXACT;868 args->filetype = XFS_DIR3_FT_DIR;869 return -EEXIST;870 }871 /*872 * Special case for ..873 */874 if (args->namelen == 2 &&875 args->name[0] == '.' && args->name[1] == '.') {876 args->inumber = xfs_dir2_sf_get_parent_ino(sfp);877 args->cmpresult = XFS_CMP_EXACT;878 args->filetype = XFS_DIR3_FT_DIR;879 return -EEXIST;880 }881 /*882 * Loop over all the entries trying to match ours.883 */884 ci_sfep = NULL;885 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;886 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {887 /*888 * Compare name and if it's an exact match, return the inode889 * number. If it's the first case-insensitive match, store the890 * inode number and continue looking for an exact match.891 */892 cmp = xfs_dir2_compname(args, sfep->name, sfep->namelen);893 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {894 args->cmpresult = cmp;895 args->inumber = xfs_dir2_sf_get_ino(mp, sfp, sfep);896 args->filetype = xfs_dir2_sf_get_ftype(mp, sfep);897 if (cmp == XFS_CMP_EXACT)898 return -EEXIST;899 ci_sfep = sfep;900 }901 }902 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);903 /*904 * Here, we can only be doing a lookup (not a rename or replace).905 * If a case-insensitive match was not found, return -ENOENT.906 */907 if (!ci_sfep)908 return -ENOENT;909 /* otherwise process the CI match as required by the caller */910 return xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);911}912 913/*914 * Remove an entry from a shortform directory.915 */916int /* error */917xfs_dir2_sf_removename(918 xfs_da_args_t *args)919{920 struct xfs_inode *dp = args->dp;921 struct xfs_mount *mp = dp->i_mount;922 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;923 int byteoff; /* offset of removed entry */924 int entsize; /* this entry's size */925 int i; /* shortform entry index */926 int newsize; /* new inode size */927 int oldsize; /* old inode size */928 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */929 930 trace_xfs_dir2_sf_removename(args);931 932 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);933 oldsize = (int)dp->i_disk_size;934 ASSERT(oldsize >= offsetof(struct xfs_dir2_sf_hdr, parent));935 ASSERT(dp->i_df.if_bytes == oldsize);936 ASSERT(sfp != NULL);937 ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));938 /*939 * Loop over the old directory entries.940 * Find the one we're deleting.941 */942 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;943 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {944 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==945 XFS_CMP_EXACT) {946 ASSERT(xfs_dir2_sf_get_ino(mp, sfp, sfep) ==947 args->inumber);948 break;949 }950 }951 /*952 * Didn't find it.953 */954 if (i == sfp->count)955 return -ENOENT;956 /*957 * Calculate sizes.958 */959 byteoff = (int)((char *)sfep - (char *)sfp);960 entsize = xfs_dir2_sf_entsize(mp, sfp, args->namelen);961 newsize = oldsize - entsize;962 /*963 * Copy the part if any after the removed entry, sliding it down.964 */965 if (byteoff + entsize < oldsize)966 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,967 oldsize - (byteoff + entsize));968 /*969 * Fix up the header and file size.970 */971 sfp->count--;972 dp->i_disk_size = newsize;973 974 /*975 * Reallocate, making it smaller.976 */977 sfp = xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);978 979 /*980 * Are we changing inode number size?981 */982 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {983 if (sfp->i8count == 1)984 xfs_dir2_sf_toino4(args);985 else986 sfp->i8count--;987 }988 xfs_dir2_sf_check(args);989 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);990 return 0;991}992 993/*994 * Check whether the sf dir replace operation need more blocks.995 */996static bool997xfs_dir2_sf_replace_needblock(998 struct xfs_inode *dp,999 xfs_ino_t inum)1000{1001 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;1002 int newsize;1003 1004 if (dp->i_df.if_format != XFS_DINODE_FMT_LOCAL)1005 return false;1006 1007 newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;1008 1009 return inum > XFS_DIR2_MAX_SHORT_INUM &&1010 sfp->i8count == 0 && newsize > xfs_inode_data_fork_size(dp);1011}1012 1013/*1014 * Replace the inode number of an entry in a shortform directory.1015 */1016int /* error */1017xfs_dir2_sf_replace(1018 xfs_da_args_t *args) /* operation arguments */1019{1020 struct xfs_inode *dp = args->dp;1021 struct xfs_mount *mp = dp->i_mount;1022 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;1023 int i; /* entry index */1024 xfs_ino_t ino=0; /* entry old inode number */1025 int i8elevated; /* sf_toino8 set i8count=1 */1026 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */1027 1028 trace_xfs_dir2_sf_replace(args);1029 1030 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);1031 ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));1032 ASSERT(dp->i_df.if_bytes == dp->i_disk_size);1033 ASSERT(sfp != NULL);1034 ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));1035 1036 /*1037 * New inode number is large, and need to convert to 8-byte inodes.1038 */1039 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {1040 int error; /* error return value */1041 1042 /*1043 * Won't fit as shortform, convert to block then do replace.1044 */1045 if (xfs_dir2_sf_replace_needblock(dp, args->inumber)) {1046 error = xfs_dir2_sf_to_block(args);1047 if (error)1048 return error;1049 return xfs_dir2_block_replace(args);1050 }1051 /*1052 * Still fits, convert to 8-byte now.1053 */1054 xfs_dir2_sf_toino8(args);1055 i8elevated = 1;1056 sfp = dp->i_df.if_data;1057 } else1058 i8elevated = 0;1059 1060 ASSERT(args->namelen != 1 || args->name[0] != '.');1061 /*1062 * Replace ..'s entry.1063 */1064 if (args->namelen == 2 &&1065 args->name[0] == '.' && args->name[1] == '.') {1066 ino = xfs_dir2_sf_get_parent_ino(sfp);1067 ASSERT(args->inumber != ino);1068 xfs_dir2_sf_put_parent_ino(sfp, args->inumber);1069 }1070 /*1071 * Normal entry, look for the name.1072 */1073 else {1074 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;1075 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {1076 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==1077 XFS_CMP_EXACT) {1078 ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);1079 ASSERT(args->inumber != ino);1080 xfs_dir2_sf_put_ino(mp, sfp, sfep,1081 args->inumber);1082 xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);1083 break;1084 }1085 }1086 /*1087 * Didn't find it.1088 */1089 if (i == sfp->count) {1090 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);1091 if (i8elevated)1092 xfs_dir2_sf_toino4(args);1093 return -ENOENT;1094 }1095 }1096 /*1097 * See if the old number was large, the new number is small.1098 */1099 if (ino > XFS_DIR2_MAX_SHORT_INUM &&1100 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {1101 /*1102 * And the old count was one, so need to convert to small.1103 */1104 if (sfp->i8count == 1)1105 xfs_dir2_sf_toino4(args);1106 else1107 sfp->i8count--;1108 }1109 /*1110 * See if the old number was small, the new number is large.1111 */1112 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&1113 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {1114 /*1115 * add to the i8count unless we just converted to 8-byte1116 * inodes (which does an implied i8count = 1)1117 */1118 ASSERT(sfp->i8count != 0);1119 if (!i8elevated)1120 sfp->i8count++;1121 }1122 xfs_dir2_sf_check(args);1123 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);1124 return 0;1125}1126 1127/*1128 * Convert from 8-byte inode numbers to 4-byte inode numbers.1129 * The last 8-byte inode number is gone, but the count is still 1.1130 */1131static void1132xfs_dir2_sf_toino4(1133 xfs_da_args_t *args) /* operation arguments */1134{1135 struct xfs_inode *dp = args->dp;1136 struct xfs_mount *mp = dp->i_mount;1137 struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data;1138 char *buf; /* old dir's buffer */1139 int i; /* entry index */1140 int newsize; /* new inode size */1141 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */1142 int oldsize; /* old inode size */1143 xfs_dir2_sf_entry_t *sfep; /* new sf entry */1144 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */1145 1146 trace_xfs_dir2_sf_toino4(args);1147 1148 /*1149 * Copy the old directory to the buffer.1150 * Then nuke it from the inode, and add the new buffer to the inode.1151 * Don't want xfs_idata_realloc copying the data here.1152 */1153 oldsize = dp->i_df.if_bytes;1154 buf = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);1155 ASSERT(oldsfp->i8count == 1);1156 memcpy(buf, oldsfp, oldsize);1157 /*1158 * Compute the new inode size.1159 */1160 newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;1161 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);1162 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);1163 /*1164 * Reset our pointers, the data has moved.1165 */1166 oldsfp = (xfs_dir2_sf_hdr_t *)buf;1167 sfp = dp->i_df.if_data;1168 /*1169 * Fill in the new header.1170 */1171 sfp->count = oldsfp->count;1172 sfp->i8count = 0;1173 xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));1174 /*1175 * Copy the entries field by field.1176 */1177 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),1178 oldsfep = xfs_dir2_sf_firstentry(oldsfp);1179 i < sfp->count;1180 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),1181 oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {1182 sfep->namelen = oldsfep->namelen;1183 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));1184 memcpy(sfep->name, oldsfep->name, sfep->namelen);1185 xfs_dir2_sf_put_ino(mp, sfp, sfep,1186 xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));1187 xfs_dir2_sf_put_ftype(mp, sfep,1188 xfs_dir2_sf_get_ftype(mp, oldsfep));1189 }1190 /*1191 * Clean up the inode.1192 */1193 kfree(buf);1194 dp->i_disk_size = newsize;1195 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);1196}1197 1198/*1199 * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.1200 * The new entry w/ an 8-byte inode number is not there yet; we leave with1201 * i8count set to 1, but no corresponding 8-byte entry.1202 */1203static void1204xfs_dir2_sf_toino8(1205 xfs_da_args_t *args) /* operation arguments */1206{1207 struct xfs_inode *dp = args->dp;1208 struct xfs_mount *mp = dp->i_mount;1209 struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data;1210 char *buf; /* old dir's buffer */1211 int i; /* entry index */1212 int newsize; /* new inode size */1213 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */1214 int oldsize; /* old inode size */1215 xfs_dir2_sf_entry_t *sfep; /* new sf entry */1216 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */1217 1218 trace_xfs_dir2_sf_toino8(args);1219 1220 /*1221 * Copy the old directory to the buffer.1222 * Then nuke it from the inode, and add the new buffer to the inode.1223 * Don't want xfs_idata_realloc copying the data here.1224 */1225 oldsize = dp->i_df.if_bytes;1226 buf = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);1227 ASSERT(oldsfp->i8count == 0);1228 memcpy(buf, oldsfp, oldsize);1229 /*1230 * Compute the new inode size (nb: entry count + 1 for parent)1231 */1232 newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;1233 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);1234 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);1235 /*1236 * Reset our pointers, the data has moved.1237 */1238 oldsfp = (xfs_dir2_sf_hdr_t *)buf;1239 sfp = dp->i_df.if_data;1240 /*1241 * Fill in the new header.1242 */1243 sfp->count = oldsfp->count;1244 sfp->i8count = 1;1245 xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));1246 /*1247 * Copy the entries field by field.1248 */1249 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),1250 oldsfep = xfs_dir2_sf_firstentry(oldsfp);1251 i < sfp->count;1252 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),1253 oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {1254 sfep->namelen = oldsfep->namelen;1255 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));1256 memcpy(sfep->name, oldsfep->name, sfep->namelen);1257 xfs_dir2_sf_put_ino(mp, sfp, sfep,1258 xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));1259 xfs_dir2_sf_put_ftype(mp, sfep,1260 xfs_dir2_sf_get_ftype(mp, oldsfep));1261 }1262 /*1263 * Clean up the inode.1264 */1265 kfree(buf);1266 dp->i_disk_size = newsize;1267 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);1268}1269